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Vertical angles because they are intersecting lines, and are opposite each other.

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This is a right angle because the right angles on the door are 90 degrees.

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This is an obtuse angle because it is bigger than a right angle (90 degrees).

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Square because it has 4 congruent sides (carpet), and they add up to 360 degrees.

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Triangle because it has 3 sides, and adds up to 180 degrees.

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This is a circle because it is a sphere, and is completely round.

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Midpoint because the point in the middle of the ball, cuts the line right in the middle before it continues the line.

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The top and bottom of the picture frame are congruent, same sized segments.

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This is perimeter because you are adding up all the sides to the fence.

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Planes intersecting at one line. (Squares, in the same plane)

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Two lines lying in the same plane, never intersecting.

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Two lines intersecting at exactly one point.

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Line Segment because it is two points, that end, and do not extend, forever.

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The piece of wood that extends forever in both directions.

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Points that are lying on the same line.

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Balls that are lying in the same plane.

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The wall, a flat surface.

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The point toward the top part of the ball.